Electron-acoustic solitons and double layers in the inner magnetosphere: ELECTRON-ACOUSTIC SOLITONS
Abstract
The Van Allen Probes observe generally two types of electrostatic solitary waves (ESW) contributing to the broadband electrostatic wave activity in the nightside inner magnetosphere. ESW with symmetric bipolar parallel electric field are electron phase space holes. The nature of ESW with asymmetric bipolar (and almost unipolar) parallel electric field has remained puzzling. To address their nature, we consider a particular event observed by Van Allen Probes to argue that during the broadband wave activity electrons with energy above 200 eV provide the dominant contribution to the total electron density, while the density of cold electrons (below a few eV) is less than a few tenths of the total electron density. We show that velocities of the asymmetric ESW are close to velocity of electron-acoustic waves (existing due to the presence of cold and hot electrons) and follow the Korteweg-de Vries (KdV) dispersion relation derived for the observed plasma conditions (electron energy spectrum is a power law between about 100 eV and 10 keV and Maxwellian above 10 keV). The ESW spatial scales are in general agreement with the KdV theory. We interpret the asymmetric ESW in terms of electron-acoustic solitons and double layers (shocks waves).
- Authors:
-
[1];
[2];
[1];
[1];
[3];
[4];
[5];
[6]
- Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
- Univ. of California, Berkeley, CA (United States). Space Sciences Lab.; Taras Shevchenko National Univ. of Kiev (Ukraine)
- Univ. of California, Los Angeles, CA (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation)
- Univ. of Orleans (France)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Iowa, Iowa City, IA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA); USDOE
- OSTI Identifier:
- 1402638
- Report Number(s):
- LA-UR-17-24827
Journal ID: ISSN 0094-8276; TRN: US1702886
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 44; Journal Issue: 10; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics
Citation Formats
Vasko, I. Y., Agapitov, O. V., Mozer, F. S., Bonnell, J. W., Artemyev, A. V., Krasnoselskikh, V. V., Reeves, G., and Hospodarsky, G. Electron-acoustic solitons and double layers in the inner magnetosphere: ELECTRON-ACOUSTIC SOLITONS. United States: N. p., 2017.
Web. doi:10.1002/2017GL074026.
Vasko, I. Y., Agapitov, O. V., Mozer, F. S., Bonnell, J. W., Artemyev, A. V., Krasnoselskikh, V. V., Reeves, G., & Hospodarsky, G. Electron-acoustic solitons and double layers in the inner magnetosphere: ELECTRON-ACOUSTIC SOLITONS. United States. https://doi.org/10.1002/2017GL074026
Vasko, I. Y., Agapitov, O. V., Mozer, F. S., Bonnell, J. W., Artemyev, A. V., Krasnoselskikh, V. V., Reeves, G., and Hospodarsky, G. Sun .
"Electron-acoustic solitons and double layers in the inner magnetosphere: ELECTRON-ACOUSTIC SOLITONS". United States. https://doi.org/10.1002/2017GL074026. https://www.osti.gov/servlets/purl/1402638.
@article{osti_1402638,
title = {Electron-acoustic solitons and double layers in the inner magnetosphere: ELECTRON-ACOUSTIC SOLITONS},
author = {Vasko, I. Y. and Agapitov, O. V. and Mozer, F. S. and Bonnell, J. W. and Artemyev, A. V. and Krasnoselskikh, V. V. and Reeves, G. and Hospodarsky, G.},
abstractNote = {The Van Allen Probes observe generally two types of electrostatic solitary waves (ESW) contributing to the broadband electrostatic wave activity in the nightside inner magnetosphere. ESW with symmetric bipolar parallel electric field are electron phase space holes. The nature of ESW with asymmetric bipolar (and almost unipolar) parallel electric field has remained puzzling. To address their nature, we consider a particular event observed by Van Allen Probes to argue that during the broadband wave activity electrons with energy above 200 eV provide the dominant contribution to the total electron density, while the density of cold electrons (below a few eV) is less than a few tenths of the total electron density. We show that velocities of the asymmetric ESW are close to velocity of electron-acoustic waves (existing due to the presence of cold and hot electrons) and follow the Korteweg-de Vries (KdV) dispersion relation derived for the observed plasma conditions (electron energy spectrum is a power law between about 100 eV and 10 keV and Maxwellian above 10 keV). The ESW spatial scales are in general agreement with the KdV theory. We interpret the asymmetric ESW in terms of electron-acoustic solitons and double layers (shocks waves).},
doi = {10.1002/2017GL074026},
journal = {Geophysical Research Letters},
number = 10,
volume = 44,
place = {United States},
year = {Sun May 28 00:00:00 EDT 2017},
month = {Sun May 28 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
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Formation of Asymmetric Electron Acoustic Double Layers in the Earth's Inner Magnetosphere
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